diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index c331c5e6..290b0708 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -75,6 +75,9 @@ jobs:
 
       - name: Build
         env:
+          RUSTFLAGS: ${{ startsWith(matrix.target, 'x86_64') && '-C target-cpu=x86-64-v3' || '' }}
+          CARGO_PROFILE_RELEASE_OPT_LEVEL: "3"
+          CARGO_PROFILE_RELEASE_LTO: "thin"
           # Embed the tag as the version explicitly; actions/checkout
           # fetches a shallow clone, so `git describe` may not see it.
           PHPANTOM_GIT_VERSION: ${{ env.RELEASE_TAG }}